Everything I've read says HDD prices won't be coming down int he near future...possibly into 2014. Thailand is still recovering from the floods, unfortunately.
The last time I spent that much money on a hard drive was back in 1998, when I paid about $300 for a 6GB Western Digital at Sam's Club LOL.
If it were me, I'd wait to catch some internal 3TBs on sale for around $100, unless you specifically want external. Not sure if I would wait when running out of space or not, tho, but I'm just getting started in HTPCs.